All "states-of- the-art" associated with the Missile/Space industry have been forced to progress and develop rapidly within the past few years. This rate of development is expected to increase within the coming years, however impossible it may seem.
Arch D. Smith,
"Engineering Photography Methods For The Titan II. Research And Development Flight Program," Optical Engineering 3(2), 030260 (1 January 1965). https://doi.org/10.1117/12.7971313